1Q71

The structure of microcin J25 is a threaded sidechain-to-backbone ring structure and not a head-to-tail cyclized backbone

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D TOCSY	0.3 mg of microcin J25	100% CD3OH	0		ambient	298
2	2D NOESY	0.3 mg of microcin J25	100% CD3OH	0		ambient	298
3	E-COSY	0.3 mg of microcin J25	100% CD3OH	0		ambient	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DMX	750
2	Bruker	AVANCE	500

NMR Refinement
Method	Details	Software
Structures were calculated by torsion angle dynamics and refined in a water shell using Cartesian dynamics within CNS.	Preliminary structures were generated by torsion angle dynamics using CNS. Structures were subsequently subjected to further molecular dynamics and energy minimisation in a water shell using protocols from ARIA within CNS.	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations,structures with the lowest energy
Conformers Calculated Total Number	50
Conformers Submitted Total Number	20
Representative Model	1 (lowest energy)

Additional NMR Experimental Information
Details	This structure was determined using standard 2D homonuclear techniques.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	XwinNMR	3.1	Bruker
2	data analysis	XEASY	1.3.7	Eccles, C., Guntert, P., Billeter, M. and Wuthrich, K.
3	structure solution	DYANA	1.5	Guntert, P., Mumenthaler, C. and Wuthrich, K.
4	refinement	CNS	1.0	Brunger, A.T. et al.

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.